Firstly my understanding of sound systems and associated terminology is very basic so please go easy on me:-) As I often do I jumped into my 08 210 today to pump up the sounds and enjoy some of my favorite tunes from the factory Clarion & Polk audio setup. Since day one the system sounded great to me and has performed flawlessly.....until now that is:-( The sound emitting from the cockpit and tower speakers at low volume was ok, distorted at mid volume and unbearable at a higher volume. What would cause this to happen so suddenly (incorrect amp settings, blown amp(s), speakers or faulty head unit/connections??) Also what are crossovers and how do you set these up correctly? Any help is greatly appreciated!